28655266641 has 16 divisors (see below), whose sum is σ = 38600924544. Its totient is φ = 18907543424.

The previous prime is 28655266637. The next prime is 28655266643. The reversal of 28655266641 is 14666255682.

It is a cyclic number.

It is not a de Polignac number, because 28655266641 - 2² = 28655266637 is a prime.

It is a super-2 number, since 2×28655266641² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28655266643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6006 + ... + 239471.

It is an arithmetic number, because the mean of its divisors is an integer number (2412557784).

Almost surely, 2^28655266641 is an apocalyptic number.

It is an amenable number.

28655266641 is a deficient number, since it is larger than the sum of its proper divisors (9945657903).

28655266641 is a wasteful number, since it uses less digits than its factorization.

28655266641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245880.

The product of its digits is 4147200, while the sum is 51.

It can be divided in two parts, 28655 and 266641, that added together give a triangular number (295296 = T₇₆₈).

The spelling of 28655266641 in words is "twenty-eight billion, six hundred fifty-five million, two hundred sixty-six thousand, six hundred forty-one".